Pressure apparatus



April 20, 1943. M. KNIGHT PRESSURE APPARATUS Filed Dec. 14, 1939 6 Sheets-Sheet l Jnvcntor MILTON KNIGHT? Gnorncg M. KNIGHT 2,317,276

PRESSURE APPARATUS Filed Dec. 14, 1959 6 Sheets-Sheet 2 April 20, 1943.

and

A ril 20, 1943. M. KNIGHT PRESSURE APPARATUS Filed Dec. 14, 1939 6 Sheets-Sheet 3 nnentor MILTON KNIGHW Gnorneg M. KNIGHT PRESSUEE APPARATUS Fi led Dec. 14. 1939 April 20, 1943.

6 Sheets-Sheet 5 m N m. m

7 a 6 7A i 6 B attorney PRESSURE APPARATUS Filed Dec. 14. 1939 M, KNIGHT 6 Shuts-Sheet 6 3nventor M/Lro/v fflwql-l'vt Gnorneg Patented Apr. 20, 1943 2,317,276 ransstmn APPARATUS Milton Knight, Perrysburg, Ohio. assignor to Idbbey-Owens-Ford Glass Company, Toledo,

Ohio, a corporation of Ohio Application December 14, 1939, Serial No. 309,136

9Claims.

The present invention relates broadly to pressure apparatus and more particularly to improved apparatus of this character which is especially adapted for use in the manufacture of laminated safety glass.

Generally speaking, laminated safety glass comprises two or more sheets of glass and one or more interposed plastic membranes all bonded together to form a composite structure. In order to obtain a satisfactory bond between the several laminations it is customary, after the glass and plastic layers have been assembled in proper superimposed relationship, to subject the resulting sandwich to the combined action of heat and pressure in an autoclave.

The apparatus now generally used for this purpose comprises a vessel type autoclave containing a pressing fluid and within which a group of sandwiches to be treated is placed. When loaded, the autoclave is closed and the liquid therein is heated and placed under pressure. After the heat and pressure have been maintained for a suflicient length of time to properly bond the laminations together, the liquid is cooled to reduce the temperature of the sandwiches, and finally the pressure is released to permit the autoclave to be opened.

It will be readily seen that when a vessel type autoclave is used, the pressing operation must be performed intermittently since only one group of sandwiches can be treated at the same time. Further,-the liquid within the autoclave must be alternately heated and cooled and, in addition, pressure must be built up for each group of sandwiches, and this pressure subsequently exhausted before the sandwiches can be removed from the autoclave and a new group introduced.

It is an aim of the present invention to overcome these objections and to make possible an uninterrupted flow of production by the provision of an autoclave adapted to contain a fluid which is continually under pressure and within which successive sandwiches or groups of sandwiches can 'be subjected to the desired cycle and degree of temperatures and pressure while moving through the autoclave in a continuous or semi-continuous manner.

Another object of the invention is the provision, in an autoclave of the above character, of a novel type of lock associated with the entrance and the discharge ends thereof whereby succes-.

ends respectively of the autoclave.

Still another object is the provision, in pressure apparatus of the above character, of means rr ed within the autoclave and the locks for supporting the sandwiches and causing them to move therethrough by gravity and in a substantially continuous manner.

Further objects and advantages of the invention will become more apparent during the course of the following description when taken in connection with the accompanying drawings.

In the drawings wherein like numerals are employed to designate like parts throughout the same:

Fig. 1 is a longitudinal, vertical section through one form of apparatus embodying the invention;

Fig. 2 is a vertical section through the lock associated with the entrance end of the autoclave in Fig. 1;

Fig. 3 is a section taken substantially on the line 3-3 in Fig. 2;

Fig. 4 is a vertical section through the lock associated with the discharge end of the autoclave in Fig. 1;

Fig. 5 is a section taken substantially on the line 55 in Fig. 2;

Fig. 6 is a. section taken substantially on the line 6-6 in Fig. 4 v

Fig. '7 is a section taken substantially on the line 1-1 in Fig. 6;

Fig. 8 is a longitudinal, vertical section through a modified form of apparatus;

Fig. 9 is a section taken substantially on the line 9-9 in Fig. 8;

Fig. 10 is a vertical section through the lock associated with the discharge end of the autoclave in Fig. 8;

Fig. ll is an end view of a modified form of apparatus; and

Fig. 12 is a vertical section through a modified form of lock.

Referring now more particularly to the drawing s, there has been illustrated in Fig. 1 one form of pressure apparatus embodying the invention.

This apparatus comprises broadly an autoclave A, through which the glass-plastic sandwiches pass during the pressing operation, and locks B and C associated with the entrance and discharge Both the autoclave A and the locks B and C are adapted to contain a liquid which may be oil, carbitol, or other suitable pressing medium. The liquid within the autoclave A will be under pressure at all times, while the pressure on the liquid within the locks B and C can be alternately built up and exhausted during operation of the locks in a manner to permit successive sandwiches to be introduced into and subuquently discharged from the autoclave A while maintaining the pressure andtemperatures oi the liquid therein substantially constant. I

The apparatus of the present invention may be readily adapted for use with any desired cycle or degree of temperatures or pressures but,'for the purpose oi illustration, a constructionhas been shown wherein sandwiches passing through the autoclave A will first be subjected to the combined action of heat and pressure, until proper bonding oi the laminations has been eifected, and then cooled under pressure for a relatively shorter time before being discharged from the autoclave.

To this end, the autoclave A is in the iorm of a horizontally arranged, cylindrical chamber 2|, containing a liquid 2|, and having the upper right and lower left hand corners thereof cut down as at 22 and 23 in order to reduce the ex-- cess fluid capacity of the-autoclave. The chamber II is divided into upper and lower communicating compartments 24 and 28 by means oi spaced walls 28, 21 and 28, 29 connected at their lower and upper ends respectively by cross walls ill and II to form a restricted passageway 32 be- ,tween the compartments.

Sandwiches 33 to be treated may be conveyed through the autoclave A in any desired manner, but is is preferred that they be supported for movement by gravity upon a slide or the like 34, arranged within the chamber at an angle to the horizontal, and extending from the entrance to the discharge end thereof. The slide 34 rests upon the cross wall II and is further supported upon a series of laterally extending channels ll secured at their opposite ends to the side walls of the chamber 20.

In order to treat the sandwiches in the manner described above, as they move by gravity through the autoclave A, the liquid in both of the compartments 24 and "must be under pressure -and this may be accomplished by introducing compressed air into the space 38, above the liquid 2| in compartment 2!, through a pipe communicating therewith and connected to a suitable air compressor or the like (not shown). In addition, the liquid in the compartment 24 must be heated while the liquid in the compartment is cooled. The desired temperatures may be set up and maintained in any well known manner'such as by temperature control means within the compartments or by suitable liquid circulating means connected with the compartments and having temperature control means interposed in their circulating lines.

Once the proper pressure and temperature conditions have been established within the autoclave A, there will be little or no temperature exchange between the two compartments 2 and 25 because they will be insulated from-each other by the air space between the walls 20, 21 and 28, II and also because the tendency of the heated liquid within the upper compartment 24 will be to rise while the relatively cooler liquid within the lower compartment 25 will have a tendency to fall. Temperature exchange maybe further prevented by'means oi. a curtain 38 secured at its upper edge to the wall 21 and adapted to lightly engage the slide 34, the curtain being suiliciently flexible to permit it to be moved aside by sandwiches 38 as they move through the passageway 32.

gamers can be introduced into the autoclave A without disturbing the pressureconditions therein by meansofthelockBassociatedwlththeenti-ance endoftheautoclave. As bestshowninrlgaz and 8. thislock comprises a cylindrical chamber or drum 3! arranged'within a vertical sleeve I formedinthe outerendandsidewallsofthe compartment 24 adjacent the top thereof.

The chamber a is rotatably mounted within the sleeve II by means of upwardly extending bosses 4| and 41 formed centrally of the bottom and top walls 43 and M respectively of the chamher It and provided with central openings there- As pointed out above, sandwiches to be tre ted ,75

through. The boss II is adapted to embrace a sleeve ll threaded onto a stationary pin or shaft ll, which shaft is threaded thrwgh the bottom of the sleeve ll and extends upwardly into the chamber IO. The boss is iournaled within a bearing portion 41 formed in the top wall of the compartment 24" and carries adjacent its upper end and keyed thereto a worm wheel 0 adapted to mesh witha worm" connected to a suitable source of power ior rotating the chamber ll.

The sandwiches It pass into and out of the chamber 30 throughentrance and discharge ll, arranged exteriorly of the lock 8 and upon which sandwiches move into the chamber 31' and also with the slide 34 within the autoclave A.

In order to permit sandwiches to be introduced into the lock B and subsequently discharged therefrom into the autoclave A, the sleeve II is provided with cut-out portions and it communicating with the outside atmosphere and the interior of the compartment 24 respectively. A tight illt is provided between the chamber 30 and the sleeve 4| to prevent the escape of iiuid from the autoclave A. As additional precautions, suitable packing glands 51 are provided and also adjustable joints 58 which are slidable in dovetail grooves 59 in the end wall of the compartment 24 and are controllable by suitable Jack-screws I threaded through a frame 0| 'exteriorly of the sleeve ll.

A supply oi pressing liquid 62 is maintained within the chamber 3! at all times, the level of the liquid being just below the entrance slot II and substantially equal to the level of the liquid ii in the compartment 24 of the autoclave A. With the chamber 39 in charging position (Fig. 2), the slot 50 will be open to permit a sandwich 33 to move by gravityinto the chamber from the slide 54 while the slot II will be closed by the lower portion of the sleeve lll. After receiving a sandwich, the chamber 3! will be rotated 90 degrees in the direction of the arrow (Fig. 3'), which will cause both of the slots II and ii to be closed by the side wall 83 of. the sleeve II. The pressure of the liquid 62 within the chamber 39 may now be built up to substantially that of the liquid 2| in. the autoclave A by introducing compressed air into the space 64 above the liquid 62 through a conduit 65 passing through a stationary sleeve 68 in the boss 42 and having suitable connection with an air compressor or the like. when the pressure within the chamber provided. The slide 34 is also provided with 39 has been built up to the proper point, the

chamber is again rotated 90 degrees to place the openings 50 and 5| in communication with the compartment 24 of the autoclave A as shown in broken lines in Fig. 2. At this time the discharge opening 5I is in alignment with the lower end of the slide 52 and the sandwich 33, continuing its movement, will pass from the chamber 39 into the compartment 24.

After discharging the sandwich, the chamber 39 is rotated 90 degrees for the third time to again cause the openings 50 and 5I to be closed, this time by the opposite side wall 61 of the sleeve 40. The compressed air within the space 64 is then exhausted through the conduit 65 so that upon a fourth 90 degree rotation of the chamber, to return it to charging position, it will be in condition to receive the next sandwich to be treated.

Although the speed of rotation of the chamber 39 and the speed of gravitational movement of the sandwich 33 can be so controlled that the chamber will reach discharge position just prior to the movement of the sandwich through the discharge opening 5|, it is preferred to provide a'positive stop means which will prevent any possibility of the sandwich striking the wall of the chamber 39 before the opening 5| is in alignment with the slide 52.

To this end there is provided, adjacent the lower end of the slide 52, a cut-out portion 69 within which is pivotally mounted as at 69 a latch member I0. The latch member I comprises an arm II carrying an upturned catch plate I2 faced with rubber, felt orother relatively soft material I3 and a downwardly extending bracket 14 carrying a cam wheel "I5. The catch plate I2 is adapted to be positioned within the path of travel of the sandwich 33 over the slide 52, during rotary movement of the chamber 39 from charging to discharging position, by a cam plate I5 carried upon the bottom of the chamber 39 and arranged to slide beneath the wheel I5. The cam plate I6, which is semi-circular in extent and provided with tapered ends I6 is so positioned that, when the chamber 39 is in charging position (Figs. 3 and 4) and during rotary movement thereof from charging to discharging position, the plate IE will be under the wheel I5. Upon continued movement of the chamber 39 into discharge position, the cam plate I6 will move from under the wheel I5 (Fig. 4) causing the latch member I0 to drop to the broken line position (Fig. 2) and permitting the sandwhich 33 to move through the discharge opening 5| into the compartment 24 of the auto elave A.

From the above, it will be evident that upon proper operation of the lock B, sandwiches to be treated may be introduced therethrough into the autoclave A without affecting the pressure of the liquid in the autoclave. Further, since the chamber 39 is in open communication with the compartment 24 of the autoclave A at regular intervals, the temperature of the liquid within the chamber 39 will be maintained substantially thesame as that in the compartment 24 without the use of independent heating means although such means may be provided if desired.

After leaving the lock B, the sandwiches 33 will continue to move by gravity along the slide 34 within the autoclave, being maintained in proper line by side flanges II with which all three of the supporting slides 34, 52 and 54 are openings I3 (Fig. 3) to equalize the pressure on both sides of the moving sandwiches and prevent any possibility of drag. The speed of movement of the sandwiches 33 through. the autoclave A will be so controlled, by the angle of the slide 34, that they will remain within the compartment 24 a sufllcient length of time to permit the action of theheated fluid under pressure therein to properly bond the several laminations together, after which the sandwiches will be cooled under pressure for a shorter, period of time within the compartment 25 before reaching the lock C.

The construction and operation of the lock C, associated with the discharge end of the autoclave A (Figs. 1 and 5), is similar to that of the lock B just described. Thus, the lock C includes a cylindrical chamber I9 mounted for rotary movement within a vertical sleeve and provided with entrance and discharge slots 8| and 82 respectively. The top of the chamber I9 i provided at its center with a bolt 83 threaded therethrough and having a reduced portion 84 journaled within a sleeve 95 in the top of the sleeve 80.

The bottom of the chamber I9 is formed with a central, downwardly extending shaft 96 journaled within a bearing portion 81 in the bottom wall of the compartment 25 and having keyed thereto, adjacent its lower end, a worm wheel 88 meshing with a worm 89 adapted to be driven from a su table source of power to rotate the chamber I9.

Sandwiches 33 will be received within the lock C and will move therethrough upon a stationary slide 90 arranged within the chamber 19 in a manner to align with the slide 34 in the autoclave A and also with a receiving slide 9I positioned outwardly of the lock C. The slide 90 is secured to the upper end of a shaft 92 mounted exteriorly of the autoclave upon a channel iron 93 and extending upwardly through a central bore in the shaft 86 into the interior of the chamber I9. Pivotally mounted within an opening 94 in the slide 90 is a latch member 95 of the same construction as the latch member 10 and operable in the same manner by means of a cam plate 96 carried upon the bottom of the chamber I9.

The chamber I9 contains a supply of pressing l quid 91 and when the lock C is in charging position, as shown in full lines in Fig. 4, the entrance slot/BI of the chamber I9 will be in alignment with the slide 90 and the level of the liquid 91 will be slightly above the slot 8|, being maintained at a pressure substantially equal to that of the liquid in the compartment 25 by pressure of the air within the space 98 thereabove. Upon movement of a sandwich 33 into the chamber I9 from the compartment 25, the chamber will be rotated 90 degrees in a clockwise direction to cause the entrance and discharge openings 8I and 82 to be closed by a side wall 99 of the sleeve 80. The level of the liquid 97 must now be lowered to a point slightly below the bottom of the discharge slot 82 and for this purpose the shaft 92 i provided with a central bore I00 terminating in a transverse opening IOI communicating with the interior of the chamber 19. Connected to the lower end of the shaft 92 by fittings I02 is a conduit I03 communicating with a suitable storage tank and pump (not shown) whereby liquid may be pumped into and out of the chamber 10.

In order to prevent the formation of a vacuum in the chamber It, as liquid S1 is withdrawn therefrom, the bolt 83 is provided with a central bore IM terminating in a radial opening II! which at this time is in communication with a passageway I in the top ofthe sleeve Iii .(l 'ig. 6). The passageway III is in open communication with the outside atmowhere and permits air to flow into the chamber I. to replace the liquid I! as it is withdrawn therefrom.

After the liquid 01 has been lowered tothe proper level, the chamber II is again rotated 90 degrees in the same direction to bring the discharge opening OI into alignment with the lower end of. the slide 90 and to simultaneously lower the latch member II to permit the sandwich 33 to discharge from the lock 0. Upon discharge of the sandwich, thechamber Il-wili'again be given a 90 degree rotation to cause the entrance and discharge openings I and II to be closedby the opposite side wall of the sleeve-ll at which time liquid ll will be pumped back into the chamber I! through the conduit III until itreaches a level slightly above the top of the entrance slot ll.

With the chamber I! in this position, the radial opening Illinthebolt willbeinregisterwith a second eway III. in the top of the sleeve II (Fig. 6). This eway I" also communicates with the outside atmosphere but is pro- .vided at its outlet end with a safety valve II! (Fig. 'l). The valve III will be set at the pressure desired within the chamber II, which of coursewillbesubstantiallythesameasthat in the autoclave A. As fluid '1 isforced into the chamber II, the valve III will prevent the escape of airthrough the eway Ill until the pressure within the chamber II has been built up to the proper point. Then, as additional iluidisforcedimonlysuiiicientairwillbepiarmitted to escape'to maintain the desired pressure. Whentheliquid flhasbeenraisedtothe proper level, the chamber I! will again'be-rotated'90 degrees into charging position at which tlmeitwillbeinconditiontoreceivethenext sandwich to'be treated.

As indicated above, the speed and intervals of rotation of the chamber II in relation to the speed of movement of the sandwiches 33 through the autoclave A can be so controlled that a sand-- wich will reach the end of theslide 34 just as the chamber 1! is in position to receive it. However,asasafetymeasureandtopermitthe maximum number of sandwiches to be treated in a given period, means have been provided to positively and quickly feed the sandwiches from thecompartment II into thelockCassoonas the chamber 1! reaches charging position. For

this m, there isinterposed'in the line of.

before the chamber II is in position to receive it,

the movement of the sandwich will be arrested until the entrance opening II comes into alignment with the slide a, whereupon the rolls will i be rotated .to feed the sandwich rapidly through the opening and out of the pathof the next succeeding sandwich. On the other hand. should a sandwich be late in arriving at the proper-positlon, the rolls m and no will begin turning assoonasthechamberlaisinchargingpcsition, and when the sandwich does reach the rolls it will be quickly fed through the opening ll .be-

fore the next rotary movement of the chamber.

Ifdesired,asimilarpairofrollsmaybearraiiged' adjacent the chamber 30 of the lock 3 to facilitate the discharge of sandwiches therefrom and into the autoclave A.

In Figs. 8, 9 and 10 of the drawings, been illustrated a somewhat modified form of apparatus including anautoclave D having locks E and I" associated'withitc entrance and dIacharge ends respectively. The autoclave D lain the form of an elongated, cylindrical chamber arranged at an. angle tothe horizontal but similar in construction and operation; to the autoclave A (Fig. 1), being divided into coinmunicating compartments III and III by good The two locks a and r, through which sandwiches ll'l'enter and discharge from the autoclave D, are substantially identical in construction. A detailed description of the lock B will therefore suflice for both and the numerals used when followed by a prime mark will designate corresponding parts of the lock-F. The lock E comprisesaclosedcylindricalchamberordrum III provided with stub shafts III and III and mounted for rotary movement within a sleeve III formed in the'end wall of the autoclave D.

Theaxisofrotationofthedrum III isatright angles to the path of travel of the-s andwiches III, which arrangement permits the sandwiches to move into and out of the lock E through of the drum III of the lock is provided with a single opening or slot III and ts of the sleeve II are cut of! as at III and II! so that, pon proper rotary movement. the-drum III may be placed in open communicationeither with the outside atmosphere or the interior of the autoclave D through the opening III. In order to rotate the drum III, thestub shaft III is provided with a reduced portion III extending upwardly through a bearing II! in thetopof the autoclave D and having keyed adjacent its outer end a worm wheel III. The wormwheel III is adapted tomesh with a worm Illsecured to one end of a line shaft III driven by a motor III mounted upon the autoclave.

The opening II! is in alignment with a supporting platform I mounted within the drum III and carried thereby. Formed upon the upper surface of the platform Ill near the end remote from the opening III is a stop or bumper strip III which acts to limit the movement of sandwiches coming into the lock E and prevents their striking the side wall of the drum III. With the drum. III in the position shown in Fig. 8, the opening I25 will also be in alignment with a slide I36 outside of the autoclave and a sandwich placed upon this slide will move I31 in the drum I2I is slightly below the opening I25 as shown in full lines in Fig. 8. The motor I33 is then started to rotate the drum I2I ninety degrees in the direction of the arrow (Fig. 9) and thus cause the opening I25 to be closed by the side wall I30 of the sleeve I24. With the drum in this position, sidewise movement of the sandwich on the platform I34 will be prevented by the side rail I33. Additional liquid is then forced into the drum I2I through a supply conduit I40, communicating therewith through a central opening in the shaft I23, to bring the level of the liquid I31 above the opening I25 and to build up the pressure within the drum to a point substantially equal to that q within the autoclave D.

The drum I2I is then rotated another 90 degrees in the same direction to bring theopening I25 into alignment with the slide II6. Now the movement of the sandwich I I1 upon the platform I34 will be unobstructed either by the side flanges I39 or'the stop I35 so that it is free to move by gravity through the opening I25 and onto the slide IIB. When the sandwich II1 has passed completely into the compartment II2 of the autoclave, the drum I2I is rotated 90 degrees a third time to again cause the opening I25 to be closed, this time by the side wall I of the drum I2I. A portion of the liquid I31 is then withdrawn through the conduit I40 to bring the level down to the full line position of Fig. 8 and to release the pressure thereon after which the drum I2I is again rotated 90 degrees to bring it back to its original or charging position.

The drums I2I and I2I of the locks E and F respectively are rotated simultaneously upon operation of the motor I33 and are so timed that the lock E is in readiness to receive a sandwich to be treated at the same time as the lock F is ready to receive one to be discharged from the autoclave D. In this way the maximum capacity of the autoclave can be utilized and a new sandwich will be introduced therein each time a finished one is discharged.

After a sandwich II1 has passed from the lock E into compartment II2 of the autoclave D, it will continue its gravitational movement upon the slide I I6, during which time it will be progressively subjected to the proper temperature and pressure conditions, by action of the liquid II8, until it contacts the rolls I42 and I43 in compartment H3 at the discharge end of the autoclave. The rolls will begin rotating in opposite directions to feed the sandwich rapidly into the lock F as soon as the drum I2I thereof arrives at receiving position (Fig. 10) At this time the level of the liquid I31! in the drum I2I is just a slide I44 outside of the autoclave. The third movement again closes the opening I to permit the proper pressure to be built up in the drum I2I by forcing in additional liquid through the conduit I40, after which the fourth movement will return the drum to loading position with the opening I25 in open communication with the interior of the autoclave D. Suitable air conduits and valves, such as illustrated in Figs. 6 and 7, may be associated with the locks E and F to facilitate the pumping of pressing liquid into and out of the drums I2I and I2I.

The pressure apparatus so far described has been shownas accommodating only a single line 0T sandwiches moving therethrough It will be understood, however, that two or more lines of sandwiches may be treated at the same time by the provision of additional supporting slides and platforms arranged one above another within the autoclaves and locks. Another way in which the capacity of pressure apparatus of this character can be increased is by the use of multiple locks associated with each end of the autoclave. A construction of this type has been illustrated diagrammatically in Fig. 11 wherein double locks G and H have been shown associated with the discharge end of an autoclave I. The locks G and H are adapted to align with a similar pair of locks associated with the entrance end of the autoclave I (not shown) to permit two lines of sandwiches to be moved through the autoclave at the same time.

This arrangement also makes possible a more eificient handling of the pressure liquid within the locks. Thus, the lock G is in position to dis charge a sandwich and the liquid I45 therein is below the opening I46 and at atmospheric pressure when the lock H is in position to receive a sandwich and the liquid I41 therein is at a high level and under elevated pressure. Before the drum I48 of the lock G can be brought into receiving position and the drum I49 of thev lock H brought into discharging. position, additional liquid must be forced into the lock G and some of the liquid I41 must be removed from the lock H. This can be readily accomplished by transferring liquid from the lock H to the lock G through a conduit I50 by means of a pump I5I interposed in the line thereof. Relatively little above the opening I25 and the pressure within The' second movement will bring the opening I25 into the broken line position in Fig. 10 and permit the sandwich to move out of the lock F and onto energy will be required to operate the pump I5I due to the fact that the pressure upon the liquid I41 will tend to force it from the lock H to the lock G until the pressure between the two is equalized. Before returning the drums I48 and I49 to their original positions, liquid can be transferred from the lock G to the lock H by simply reversing the process.

In Fig. 12 there is illustrated a modified form of lock designated in its entirety by the letter J and shown as associated with the discharge end of an autoclave K. The lock J comprises a closed cylinder or drum I52 mounted within the .end wall I53 of the autoclave K and at right angles to a slide I54 arranged within the autoclave and adapted to support glass-plastic sandwiches for movement therethrough by gravity. Suspended from the roof of the cylinder I52 by means of a bracket I55 is a supporting platform I56 in alignment with the slide I54 and also with a similar slide I51 outside of the autoclave K. Sandwiches I58 move into the lock J from the autoclave K through a slotted opening I59 in the side wall of the cylinder I52 and subsequently discharge through a second, oppositely disposed opening I60. The openings I59 and I60 are adapted to be successively opened and closed by an internal closing the openings I56 and I66, the movement of the piston I62 will also raise and lower the level or the liquid I65 within the lock J and will build up or release the pressure on said liquid.

In operation, with the piston I62 in the broken line position of Fig, 12, the lock J is ready to receive a sandwich from the autoclave K. At this time the piston I62 is Just below the platform I56 and a port I66 in the sleeve I6I is in registry with the entrance opening I56'in the cylinder I52. The level of the liquid I65 is just above the opening I59 and the pressure on the liquid is substantially equal to that on the liquid in the autoclave K. A sandwich in position to discharge from the autoclave can now move by gravity through the opening I59 and along the platform I56 until it strikes a stop I61 flxed to the top of the piston I62 and projecting upwardly through an opening I68 in the platform I56.

when the sandwich has been received within the lock J, the piston I62 is moved downwardly to cause the sleeve I6I to close the opening I56 and to also lower the level of the liquid I65 and reduce the pressure thereon. when the piston is inits lowermost position (full lines in Fig. 12) a port I69in the sleeve I6l willbe in registry with the discharge opening I 66 in the cylinder I52. The pressure on the liquid I65 will be exhausted and the level of the liquid will be below the opening I66. The stop I61 will be below the platform I56 and the sandwich I56 will be free to move out of the lock J and onto the slide I51. After discharge of the sandwich, the piston I62 can again be raised to prepare the lock J for recharging.

It is to be understood that the form of themventionherewith shown and described is to be taken as the preferred embodiment of the same, and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subioined claims.

I claim:

1. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and discharge ends of said autoclave and through which sandwiches to be treated may be into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one .of said locks comprising an apertured cylindrical chamber, clomire means for said chamber engaging the walls thereof, means for causing relative movement between the chamber and closure means to open and close said chamber, means for building up fluid pressure within the chamber, and means arranged within said autoclave and said locks and at an angle to the horizontal for supporting the sandwiches and causing them to move by gravity therethrough.

2. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and discharge-ends of said autoclave and through which sandwiches to be treated may be passed into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one of said locks comprising a slotted chamber, a sleeve provided with cut-out portions and engaging the walls of said chamber, means for causing relative movement between the chamber and sleeve to open and close said chamber, means for building up fluid pressure within said chamber and for subsequently releasing said. pressure, and

means arranged within said autoclave and said locks and at an angle to the horizontal for supporting the sandwiches and causing them to move by gravity therethroughs 3. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with he entrance and discharge ends of said autoclave and through which sandwiches to be treated may be passed into and subsequently discharged from the autoclave without materially aflecting the pressure of the fluid therein, at least one of said locks comprising an apertured chamber, closure means for said chamber engaging the walls thereof, means for causing relative movement between the chamber and closure means to open and close said chamber, means for building up fluid pressure within the chamber, means arranged within the autoclave andthe locks and at an angle to the horizontal for supporting the therethrough, and means within said locks for temporarily interrupting the movement of said sandwiches.

4. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and discharge ends of said autoclave and throuflh which sandwiches to be treated may be passed into and subsequently discharged from'the autoclave without, materially aflecting the pressure of the fluid therein, at least one of said locks comprising an apertured chamber, closure means for said chamber engaging the walls thereof, means for causing relative movement between the chamber and closure means to open and close said chamber, means for building up fluid pressure within the chamber, means arranged within the autoclave and the locks and at an angle to the horizontal for supporting the sandwiches and.causing them to move bygravity therethrough, means within said locks for temporarily interrupting the movement of said sandwiches, and means within said autoclave for interrupting and subsequently accelerating the movementof the sandwiches therethrough.

5. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and discharge ends of said autoclave and through which sandwiches to be treated may be passed into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one of said locks comprising an apertured chamber, closure means for said chamber engaging the walls,

vtherethrough, and means within said locks and operable by the relative movement between said chamber and closure means for temporarily interrupting the movement of the sandwiches.

6. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and discharge ends of said autoclave and through which sandwiches to be treated may be passed into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one of said locks comprising a substantially vertically arranged drum having an entrance and a discharge opening in substantially vertical 'alignment in one wall thereof, closure means for said openings engaging the walls of said drum, means for causing rotary movement of said drum to open and close said openings, means for building up fluid pressure within the drum, and stationary means arranged within said autoclave and said locks and at an angle to the horizontal for supporting the sandwiches for movement therethrough.

'7. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and discharge ends of said autoclave and through which sandwiches to be treated may be passed into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one of said locks comprising a cylindrical chamber having an entrance and discharge opening in one wall thereof, closure means for said opening engaging the walls of said chamber, means for rotating the chamber to open and close said opening, means for building up fluid pressure within said chamber, and means arranged within the chamber and movable therewith for supporting the sandwiches for movement therethrough.

8. In apparatus for use in the compositing of laminated safety glass, an autoclave containing fluid under pressure, locks associated with the entrance and, discharge ends of said autoclave and through which sandwiches to be treated may be passed into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one of said locks comprising a chamber containing a fluid and having an entrance and a discharge opening in opposite walls thereof, a piston operable within said chamber, a sleeve carried by said piston in engagement with the walls of the chamber and provided with cut-out portions, means for reciprocating said piston to cause the piston to build up and subsequently release the pressure of the fluid within the chamber and to cause the sleeve to open and close the openings in the walls thereof, and means arranged within said autoclave and said locks for supporting the sandwiches for movement therethrough.

9. In a pressure apparatus, an autoclave containing fluid under pressure, locks associated with the entrance and discharge ends of said autoclave and in longitudinal alignment therewith through which articles to be treated may be passed into and subsequently discharged from the autoclave without materially affecting the pressure of the fluid therein, at least one of said locks comprising an apertured chamber, closure means for said chamber engaging the walls thereof, means for causing relative movement between the chamber and closure means to open and close said chamber, and means arranged within said autoclave and said locks and at an angle to the horizontal for supporting the articles and causing them to move by gravity in a straight line therethrough.

MILTON KNIGHT. 

